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In BMWs (and most European technology), almost everything is linked to everything. Given that when you change the clock in the Board Computer, the radio clock synchronises, I'm not surprised of the connection.

Another case in point: When my independent shop installed the wrong wheel bearing (the part was wrong, and just a couple millimetres off spec), my X3 went into limp mode as I drove off from the parking space at the garage. The transmission went into fail safe mode, DSC, xDrive, and ABS all failed. Error codes galore. Because of a wheel bearing.

I really find it hard to believe that any company would wire their OBD in series with the car stereo. Talk about a point of failure.

So this means that if your car stereo takes a voltage hit and the logic circuit toasts you car could be dead in the water with updates.

That is a really bad engineering design, if it's true. I would assume the on board computer will throw a ton of errors too if the stereo is changed. How come the after market stereo manufacturer don't sue BMW?

In BMWs (and most European technology), almost everything is linked to everything. Given that when you change the clock in the Board Computer, the radio clock synchronises, I'm not surprised of the connection.

Another case in point: When my independent shop installed the wrong wheel bearing (the part was wrong, and just a couple millimetres off spec), my X3 went into limp mode as I drove off from the parking space at the garage. The transmission went into fail safe mode, DSC, xDrive, and ABS all failed. Error codes galore. Because of a wheel bearing.

I am! They could have run things in a parallel circuit and not in series. It is one thing to notify you there is an error, but to prevent other features from happening is a point of failure. And by simple definitions a bad design.

You NEVER design an electrical circuit this way if you can.

However, its something I can easily remedy. I feel sorry for those that have someone else do the work for them. And that is why I wanted to notify people of this circumstance.